https://github.com/alxnkt/mongo-to-postgres

Simple data migration from MongoDb to PostgreSQL
https://github.com/alxnkt/mongo-to-postgres

database migration mongo postgres

Last synced: 8 months ago
JSON representation

Simple data migration from MongoDb to PostgreSQL

• Host: GitHub
• URL: https://github.com/alxnkt/mongo-to-postgres
• Owner: alxnkt
• License: mit
• Created: 2020-04-19T17:19:12.000Z (about 6 years ago)
• Default Branch: master
• Last Pushed: 2024-03-23T12:52:21.000Z (over 2 years ago)
• Last Synced: 2024-04-23T14:43:28.980Z (about 2 years ago)
• Topics: database, migration, mongo, postgres
• Language: JavaScript
• Homepage: https://www.npmjs.com/package/mongo-to-postgres
• Size: 508 KB
• Stars: 11
• Watchers: 3
• Forks: 9
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

          
# Simple data migration from MongoDb to PostgreSQL

This tiny tool is used for easy data migration from MongoDb database

to PostgreSQL database. It uses appropriate ORMs: `mongoose` and 

`knex` respectively to transfer data.

## Requirements

* Node.js 13+

* MongoDb 4+

* PostgreSQL 12+

## Usage

### 1. Install package

`$ yarn add mongo-to-postgres`

OR

`$ npm i mongo-to-postgres`

### 2. Create file `migrate.js`, set migration settings in it

**IMPORTANT NOTES**

**1. You MUST respect the order of the tables. Tables with foreign keys MUST BE placed AFTER tables, from which these keys are.**

**2. This sample assumes that you have postgres database with schema, containing empty tables.**

```javascript

import migrate from 'mongo-to-postgres';

migrate({

  // Define connection strings

  connections: {

    mongo: 'mongodb://localhost/dbname',

    postgres: 'postgres://postgres:secret@localhost:5432/dbname'

  },

  // Define your database migration settings

  collections: [

    {

    collectionName: 'department',  // collection name in Mongo

    tableName: 'departments',      // table name in Postgres

    fieldsRename: [

      ['createdAt', 'created_at'], // set new name for field (optional)

      ['updatedAt', 'updated_at']  // set new name for other field (optional)

    ],

    fieldsRedefine: [

      ['dep_type', 1]              // force to set value for all records (optional)

    ]

  },

  {

    collectionName: 'award',       // collection name in Mongo

    tableName: 'awards',           // table name in Postgres

  },

  {

    collectionName: 'employee',    // collection name in Mongo

    tableName: 'employees',        // table name in Postgres

    foreignKeys: {

      department: 'department',    // foreign keys (field: collection) (optional)

    },

    links: {                       // "many-to-many" links

      awards: ['emplyees__awards', 'employee_id', 'award_id']

    }

  }

  ]

});

```

### 3. Set `package.json` `"type"` field

```json

{

  "type": "module",

  "dependencies": {

    "mongo-to-postgres": "^0.0.5"

  }

}

```

### 4. Run migration

`$ node migrate.js`